When your on ecstasy and you get stuck in the same mental thought process over and over. You can be stuck moving to a beat and not able to get out of it or even stuck focusing on lights. This usually comes from your brain not being able to handle too much ecstasy or a combo of ecstasy and another drug. You have little or no control of your body movements or thought process. Simple functions are practically impossible. You may feel like your in a dream or even see the world as cartoons. The best way to get out of a loop is to remove yourself from the continual beat and lights of an area, try to drink water and come down.

Jon: Hey bob, why is that guy walking around in circles staring at the ground?

Bob: eh hes just looping really hard.
Jon: Should we get him out of here?
Bob: Naw he will probably come out of it on his own. If he doesnt call a medic
Jon: k

The repetitious act of a high school teenager (or teenagers) driving down the main highway (or more likely, the only highway) through a podunk town, turning around at a certain landmark, driving back down the main highway, turning around at a second landmark, and repeating the process until seeing another person with whom the teenager desires to hang out. The nonsense could have been avoided with a simple phone call.

RA = Reasonable Adult who is concerned with both safety and gas prices.
TA = Teenager with or without a driver's license, yet has access to a vehicle.

RA: "So what did you kids do last Friday night?"
TA: "Oh, we just went looping."

RA: "Looping?"
TA: "Yeah, we were driving around town until we saw some friends to meet up with."

RA: "Well why didn't you just pick up the phone and call them?"
TA: "I don't know. I guess there's just an element of divine intervention and meeting up with girls."

RA: "So you met up with girls?"
TA: "No, not this time."

RA: "Do you ever meet up with girls?"
TA: "Well not yet, but there is still the possibility."

RA: "Well isn't there a place you can go to meet girls?"
TA: "Not really, we would have to drive 45 minutes to go anywhere nice."

RA: "So your town is so podunk you have to go looping around it instead of all meeting up somewhere?"
TA: "Pretty much."

Going on a hopeful walk around a busy dance floor towards the end of a night in a final attempt to bag a broad. Looping can only be considered a success if the looper successfully opens physical relations with a stranger in the looping perimeter.